Emergency multi-node jobs regress after an OFED update. What should ops consult before changing more packages?
Select an answer to reveal the explanation.
Short Explanation
After an OFED bump, check the Magnum IO compatibility matrix before piling on more package churn—emergency jobs deserve a known-good network stack. Cafeteria schedules will not fix NCCL.
Full Explanation
Emergency multi-node jobs that regress after an OFED update often hit network-stack version skew against Magnum IO. Before changing more packages, ops should consult the Magnum IO compatibility matrix for the civic network-stack versions in use so the next move is supportable rather than speculative. The matrix tells which OFED, CUDA, driver, and Magnum IO combinations are validated for multi-node IO and collectives.
A random blog with no NVIDIA compatibility notes is not an authoritative source for municipal production network stacks. The cafeteria catering schedule has no bearing on OFED or Magnum IO compatibility. GPU screensaver settings on NOC wall displays are unrelated to multi-node job regression after OFED changes.
Exam caveat: treat OFED updates as Magnum IO compatibility events—check the matrix before stacking further package changes that compound skew. Roll forward or back only to combinations the matrix supports for the civic fabric. Operational check: capture current OFED, driver, CUDA, and Magnum IO versions on the emergency cluster, look up the Magnum IO compatibility matrix, identify the nearest supported set, apply that alignment on a pilot pair of nodes, re-run the multi-node job, and only then roll the fix fleet-wide.